大话设计模式 备忘录模式

游戏保存

package org.ustc.memo;

public class GameRole {
private int vatality;
private int defence;
private int offence;
public GameRole() {
vatality = 100;
defence = 100;
offence = 100;
}
public void fight(){
vatality = 0;
defence = 0;
offence = 0 ;
}
public void display(){
System.out.println("vatality:"+vatality+"defence"+defence+"offence"+offence);
}
public void recoveryFromMemo(Memo memo){
this.defence = memo.getDefence();
this.offence = memo.getOffence();
this.vatality = memo.getVatality();
}
public Memo saveToMemo(){
return new Memo(this.vatality,this.offence,this.defence);
}

}

package org.ustc.memo;

public class Memo {
private int vatality;
private int offence;
private int defence;
public int getVatality() {
return vatality;
}
public void setVatality(int vatality) {
this.vatality = vatality;
}
public int getOffence() {
return offence;
}
public void setOffence(int offence) {
this.offence = offence;
}
public int getDefence() {
return defence;
}
public void setDefence(int defence) {
this.defence = defence;
}
public Memo(int vatality, int offence, int defence) {
super();
this.vatality = vatality;
this.offence = offence;
this.defence = defence;
}

}

package org.ustc.memo;

public class RoleStateTaker {
private Memo memo;

public Memo getMemo() {
return memo;
}

public void setMemo(Memo memo) {
this.memo = memo;
}

}

package org.ustc.memo;

public class Main {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
GameRole role = new GameRole();
role.display();
RoleStateTaker roleState = new RoleStateTaker();
roleState.setMemo(role.saveToMemo());
role.fight();
role.display();
role.recoveryFromMemo(roleState.getMemo());
role.display();
}

}

代码结构图：